The idea of idō in the technical program of Idōkan Yōshin-ryū jūjutsu

Problem. In the Japanese budō community, the principles of aiki (aiki in-yo ho) and jū (jū-no ri) are known. However, the concept of idō is little known, especially its translation into practice – the technical sphere of martial arts. How is idō implemented in the practice of Idōkan-style jūjutsu? Method. Knowledge resulting from many years (48 years) of shūgyō practice was used, which is related to the participant observation method / observer participation (author's own notes), and autoethnography. Since it concerns the concept of idō, the statements of the holder of the highest master's degree (10 dan) can also be treated here as an expert judgment. Additionally, qualitative methods were used, such as document analysis [archives of the Yoshin Academy and the Idokan Poland Association, including certificates, regulations, recordings, photos] and content analysis of the subject literature. Results. Idō is inscribed in some exercises, fighting techniques, counter-techniques, combinations and technical arrangements. It appears as a principle of movement, as the idea of fluidity and continuity, in the names of forms and in the name of the style. Conclusions. Within the complete system of sōgō budō in the Idōkan style, the same idea and tactical principle is implemented in jūjutsu, karate and kobudō. This is a principle related to aiki and jū, but being their evolutionarily new form, which results from the philosophy of this martial art functioning here.